Adjustable pitch-board.



No. 7|o,o58, Patented sepf. 3o, |902. f y A. Jones; f

. ADJUSTABLE FITCH BOARD.

(Application led Mar. 13, 1902.)

UNITED STATES' PATENT FFICE.

ALBERT JONES, OF RED WING, MINNESOTA.

ADJUSTABLE FITCH-BOARD.

SPECIFICATION forming part of Letters Patent No. 710,058, dated September 30, 1902.

Application filed March 13, 1902. Serial No. 98,132. (No model.)

T0 aZZ whom, ibm/wy concern.-

Beit known that I, ALBERT JONES, a citizen of the United States, residing at Red Ving, in the county of Goodhue and State of Minnesota, have invented certain new and useful Improvements in Adjustable Pitch-Boards, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to anadjustablesquare, gage, or pitch-board especially designed for use in laying oif strings or carriages for stairs. Its object, among other things, is to provide a device of simple construction which may be readily adjusted for marking a groove of desired width for the reception of the steps.

Another object is to employ means whereby the center of the groove for the reception of the nose of the step may be easily determined.

A further Objectis to provide means Whereby the device may be adjusted to any desired pitch of stairs.

With the above and other objects in View the invention consists in the novel construction and combination of parts hereinafter more fully described and claimed, and illustrated in the accompanying drawings, showing the preferred form of my invention, and in which- Figure 1 is a plan view ofthe device. Fig. 2 is an end View thereof. Fig. 3 is an end view of the adjusting mechanism at one end of the device, and Fig. 4 is an enlarged longitudinal section through the nosing-gage.

Referring to the figures by numerals of reference, 1 and 2 are the members of a preferably metallic square and each is provided with a longitudinal slot 3 and graduations along one edge adjacent thereto. In each slot 3 is slidably mounted a pin 4, having a head 5 at one end and a similar nut 6 engaging the opposite end. It is obvious that when the nut is loosened lupon the pin said pin can be adjusted to a desired point in its slot and then locked by tightening the nut.

A tapered wedge-plate. 7 is Vdetachably secured to the inner edge of each member of the square, and said plates and the square are of the same thickness. The plate 7, secured to member 2, is cut away along the graduated edge of the member so as to admit a scribing-point.

Extending from the member 1 in alinement with member 2v is an arm 8, having a slot 9 therethrough for the reception of a graduated slide 10. One end of this slide is sev cured to a strip 1l, which is of the same thickness as the member 2 and extends longitudinally thereof. A second slide 12, similar to slide 10, is slidably mounted in the outer end ofthe member 2 and is also secured to the strip 11 A set-screw 13 is arranged in the end of the arm S and the member 2, respectively, and these bear upon the graduated slides and serve to lock them in adjusted position. Each slide is adjusted by means of a screw 14, which engages the arm 8 and member 2, respectively, and each screw is swiveled in a block 15, extending laterally from the slides 10 and 12. As the screws are provided with milled heads 16, they can be readily turned by hand. j

The arm 8 and that portion of strip 11 lying adjacent thereto are cut away a sufficient distance to permit a nosing-gage of peculiar construction to rest therebetween when the two parts are together. This gage comprises a preferably rectangular strip 17, which is loosely mounted on the slide 10, the screw 14, and a pin 18, secured to the strip 11 and projecting into a recess 19inn1ember 1. Ascrew 2O is swiveled in strip 11 and engages the gage-strip 17, whereby the sameV may be adjusted from or toward the arm 8.

The strip 17 is provided with a longitudinal slot 21, within which is s lidably mounted a block 22, having an aperture therethrough for the reception of a suitable marking instrument. A longitudinally-slotted arm 23 extends from the block and is engaged by a set-screw 24, whereby the block 22 can be locked. at any point within the slot 2l to which it may be adjusted.

It is to be understood that none of the parts of the device herein described are of greater thickness than themembers of the square, and as both sides of the square are graduated the device can be reversed for marking either right or left hand stringere.

In using the invention the pins 5 are adjusted in their slots so that when resting against the edge of the stringer the grooves can be laid off at the proper pitch. The strip 11 is then adjusted from or toward member IOO 2 hy means of screws 14 until the desired width of groove is indicated by the graduations on the slides IO and 12. Nosing-gage 17 is also adjusted by the screw 20 to bring the aperture in block 22 in horizontal alinement with the center of the groove to be cut for the nosing, and said block is also adj listed back or forward until the aperture is the proper distance from the rise.

vWhen the parts have been adj usted to their proper positions as above described, the device is placed upon a stringerand said Stringer is marked by a pencil or other instrument passed alongopposite edges of memberl and along the lower edge of member 2 and the upper edge of strip ll. The center ot' the nosing-groove is marked by an instrument inserted into the block 22, and the position of the next rise is marked by an instrument placed in the slot of strip 7 at a point indicated on the graduated edge of member 2.

If tight-fitting instead of wedge grooves are desired in the stringers, the plates or strips 7 should be removed.

In the foregoing description I have shown the preferred form of my invention; but I do not limit myself thereto, as I am aware that modications may be made therein without departing from the spirit or sacricing 111e advantages thereof, and I therefore reserve the right to make such changes as fairly fall Within the scope of my invention.

Having thus fully described my invention, what I therefore claim as new, and desire to secure by Letters Patent, is

l. The combination Withasquare; ofastrip parallel to one member thereof, means for adjusting the strip from or toward said member, an arm to the square parallel to the strip, a strip between said arm and parallel strip, and means for adjusting the intermediate strip laterally.

2. The combination with a square having a slot in each member'thereof and graduations adjacent to each slot; of a pin adjustably secured in each slot and movable longitudinally therein, and a detachable wedgestrip secured to each member of the square.

3. The combination with a square; of a strip parallel to one member thereof, means for adjusting the strip from or toward said member, an arm to the square parallel to the strip, a strip between said arm and parallel strip, means for adjusting the intermediate strip laterally, and a longitudinally-movable block in the intermediate strip.

1. The combination with a square having an arm thereto; of a strip parallel to one member of the square and to said arm, means for adjustingr the strip from or toward the arm, an intermediate strip between the arm and parallel strip, means for adjusting the intermediate strip laterally, a block slidably mounted in a slot in the intermediate strip, and adjusting means for said block.

In testimony whereof I aiiix my signature in presence of two witnesses.

' ALBERT JONES.

Witnesses:

G. H. DIEPENBROCK, N. J. PHILLIPS. 

